180 
' Polygonum fiaii Bab. Sanely cornfield, adjoining Porthcothan 
Bay, N. Cornwall, v.c. 1, Aug. 22, 1921. With Eryngium mari- 
tinus, Cakile, Salsola, Lycopsis arvensis, C. Soldancella , etc. — H. S. 
Thompson. 
Euphorbia hiberna L. Boot from the Lyn Valley, N. Devon ; 
cult, at Clifton, May 28,- 1920. In cultivation this spurge 
thrives well in any sheltered spot, whilst E. pilosa seems invari- 
ably to die out in a short time. — J. W. White. 
E. amygdaloides L. (stem fasciated). Liveridge Wood, Ticken- 
ham, N. Somerset, April 30, 1921. — Ida M. Roper. 
Mercurialis ambigua Linn. Chichester, Oct. 3, 1921.— B. J. 
Burdon. M. ambigua , usually placed as a variety under M. annua , 
is distinguished by an admixture of male and female flowers in 
the inflorescence, and by its relatively narrow leaves. In these 
specimens I can find no male flowers, nor are the leaves very 
narrow : and I believe they are only female plants of ordinary 
M. annua. Doubts are cast on the constancy of this variety in 
Syme’s “ English Botany,” and in a recent paper by C. Yampolsky, 
“American Nat.” p. 280 (1920), it is stated that sex is not a fixed 
condition in M. annua, and that individual plants may change in 
this respect during their life cycle. — H. W. Pugsley. I agree 
with Mr. Pugsley ; the specimen sent me has only <j> flowers and 
comes under the type. Last year I examined a large number of 
narrow-leaved plants in Bristol, and found they were all 5 . — 
H.S.T. 
Salix alba L., var. coendea (Sm.) $ . Brook End, St. Ippolyts, 
Herts., v.c. 20, March 20 & June 5, 1921. The June leaves are 
not so characteristic, but a sheet enclosed of the leaves in October 
from the same tree shows that they correspond with those of the 
other sets gathered later. The trees planted are mixed, some 
S. alba (type), some var. coerulea, and some S. fragilis. — J. E. 
Little. In regard to the willows distributed by Mr. Little, 
reference may be added to “Journal of Botany,” March 1922, 
p. 78, “ where some liotes on my observations of the last two years, 
and incidentally of the specimens sent to the VbB.E.C., will be 
found.” 
S. alba, var. coerulea (Sm.) £ . Planted, from stands from 
Terrington St John, W. Norfolk, on Hitchin Sewage Farm, 
Herts., v.c. 20, April 18 & Sept. 12, 1921. — J.E.L. It is stated 
in B.E.C.B. 1910, p. 525, that S. alba, var. coerulea “is known 
only as a female tree.” These $ trees, however, appear to 
correspond exactly to ? trees also planted at Hitchin. I have 
